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Reference Manual
00809-0100-2230, Rev BB
August 2014
Rosemount 2230
3-8
Section 3. Installation
3.3.6 The Tankbus The Rosemount Tank Gauging system is easy to install and wire. Devices can
be “daisy-chained” thus reducing the number of segment couplers.
In a Rosemount Tank Gauging system devices communicate with a
Rosemount 2410 Tank Hub via the intrinsically safe Tankbus. The Tankbus
complies with the FISCO
(1)
FOUNDATION fieldbus standard. The Rosemount
2410 acts as power supply to the field devices on the Tankbus.
Termination
A terminator is needed at each end of a FOUNDATION Fieldbus network.
Generally, one terminator is placed in the fieldbus power supply, and the other
one in the last device in the fieldbus network.
NOTE!
Ensure that there are two terminators on the fieldbus.
The Rosemount 2410 Tank Hub acts as power supply. Since the 2410
normally is the first device in the fieldbus segment, the built-in termination is
enabled at factory.
Other devices such as the Rosemount 5900S Radar Level Gauge, the
Rosemount 2230 Graphical Field Display, and the Rosemount 2240S
Multi-input Temperature Transmitter also have built-in terminators which can
easily be enabled by inserting a jumper in the terminal block when necessary.
Segment design
When designing a FISCO fieldbus segment a few requirements need to be
considered. Cabling has to comply with FISCO requirements as described in
“Cable Selection” on page 3-7.
You will also have to ensure that the total operating current of the connected
field devices is within the output capability of the Rosemount 2410 Tank Hub.
The 2410 is able to deliver 250 mA. In a Smart Wireless System the
maximum current is 200 mA. Consequently, the number of field devices has to
be considered so that the total current consumption is less than the available
current. See section “Power Budget” in the Rosemount 2410 Reference
Manual (Document No. 300530EN) for more information
Another requirement is to ensure that all field devices have at least 9 V input
voltage at their terminals. Therefore you will have to take into account the
voltage drop in the fieldbus cables.
Distances are normally quite short between the Rosemount 2410 Tank Hub
and field devices on the tank. In many cases you can use existing cables as
long as the FISCO requirements are fulfilled (see “Cable Selection” on
page 3-7).
See section ”The Tankbus” in the Rosemount 2410 Reference Manual
(Document no. 305030EN) for more information on segment design of a
Rosemount Tank Gauging system.
(1) FISCO=Fieldbus Intrinsically Safe Concept